| 1.Product Standard: GB TB/T2347-93, AREMA or ASTM, BS and UIC, or other standard or drawing required by clients.
2.Specification: Diameter M20 M22, M24 and 3/8"to 1-1/8", without length limited.
3.Grade: 8.8, 10.9, Grade 2, Grade 5 and Grade 8.
4.Protection: Black, galvanised and hot dip galvanised.
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